Originally Posted by Mwenenzi

Note sure exactly sure what you mean by
"VS upper class booked in I) and then LAX to KOA (Hawaii) in first class on Delta (booked with VS but on Delta booking with Delta PNR access"
If a code share with one airlines flight number and yet operated by another airline options on where to credit the ff miles can be very limited.

Flying a flight marketed by one airline (codeshare-flight number), operated by a second airline and crediting the frequent flyer miles/points to a third airlines ffp is always problematic. Usually only works if all three are in the same alliance (Oneworld - Star - Skyteam) or specific provision in the ff program rules. e.g AA miles or BA avios on QF marketed flight operated by EK. With non alliance partners even if the marketing and operating carriers are both partners to your ffp the codeshare does not always earn ff miles/points.

Who sold the ticket (ticket number) can make difference with some revenue based ffp's.

www.wheretocredit.com/vs
www.wheretocredit.com/dl